// Fig. 10.8: Circle.java
// Circle class inherits from Point.

public class CircleAsShape extends PointAsShape {
  private double radius;  // Circle's radius

  // no-argument constructor; radius defaults to 0.0
  public CircleAsShape()
  {
    // implicit call to Point constructor occurs here
  }

  // constructor
  public CircleAsShape( int x, int y, double radiusValue )
  {
    super( x, y );  // call Point constructor
    setRadius( radiusValue );
  }

  // set radius
  public void setRadius( double radiusValue )
  {
    radius = ( radiusValue < 0.0 ? 0.0 : radiusValue );
  }

  // return radius
  public double getRadius()
  {
    return radius;
  }

  // calculate and return diameter
  public double getDiameter()
  {
    return 2 * getRadius();
  }

  // calculate and return circumference
  public double getCircumference()
  {
    return Math.PI * getDiameter();
  }

  // override method getArea to return Circle area
  public double getArea()
  {
    return Math.PI * getRadius() * getRadius();
  }

  // override abstract method getName to return "Circle"
  public String getName()
  {
    return "Circle";
  }

  // override toString to return String representation of Circle
  public String toString()
  {
    return "Center = " + super.toString() + "; Radius = " + getRadius();
  }

} // end class CircleAsShape